[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.972599] audit: type=1800 audit(1546535133.626:25): pid=7874 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.010302] audit: type=1800 audit(1546535133.636:26): pid=7874 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.053263] audit: type=1800 audit(1546535133.636:27): pid=7874 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 52.036075] WARNING: CPU: 0 PID: 8032 at drivers/media/common/videobuf2/videobuf2-core.c:1852 __vb2_queue_cancel+0x8f1/0xd30 [ 52.047537] Kernel panic - not syncing: panic_on_warn set ... [ 52.053412] CPU: 0 PID: 8032 Comm: syz-executor083 Not tainted 4.20.0+ #7 [ 52.060343] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.069676] Call Trace: [ 52.072260] dump_stack+0x1db/0x2d0 [ 52.075884] ? dump_stack_print_info.cold+0x20/0x20 [ 52.080893] ? __vb2_queue_cancel+0x8e0/0xd30 [ 52.085387] panic+0x2cb/0x589 [ 52.088577] ? add_taint.cold+0x16/0x16 [ 52.092546] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.097038] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.102576] ? __probe_kernel_read+0x1f4/0x250 [ 52.107164] ? __warn.cold+0x5/0x4b [ 52.110783] ? __warn+0xe8/0x1d0 [ 52.114133] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.118615] __warn.cold+0x20/0x4b [ 52.122158] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.126666] report_bug+0x263/0x2b0 [ 52.130281] do_error_trap+0x11b/0x200 [ 52.134166] do_invalid_op+0x37/0x50 [ 52.137888] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.142374] invalid_op+0x14/0x20 [ 52.145813] RIP: 0010:__vb2_queue_cancel+0x8f1/0xd30 [ 52.150901] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 15 04 00 00 48 81 c4 18 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 5f b5 3f fc <0f> 0b 49 8d 87 28 02 00 00 48 89 85 d0 fe ff ff 48 c1 e8 03 42 0f [ 52.169798] RSP: 0018:ffff88808dd27938 EFLAGS: 00010293 [ 52.175148] RAX: ffff8880a91562c0 RBX: ffff88808dd27a50 RCX: ffffffff8541d9e2 [ 52.182398] RDX: 0000000000000000 RSI: ffffffff8541e111 RDI: 0000000000000005 [ 52.189653] RBP: ffff88808dd27a78 R08: ffff8880a91562c0 R09: ffffed10430a0e8b [ 52.196905] R10: ffffed10430a0e8a R11: ffff888218507457 R12: ffff888218507454 [ 52.204164] R13: dffffc0000000000 R14: 0000000000000002 R15: ffff888218507210 [ 52.211440] ? __vb2_queue_cancel+0x1c2/0xd30 [ 52.215920] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.220403] ? __vb2_queue_cancel+0x8f1/0xd30 [ 52.224885] ? kasan_check_read+0x11/0x20 [ 52.229038] ? do_raw_spin_unlock+0xa0/0x330 [ 52.233431] ? vb2_buffer_done+0xc90/0xc90 [ 52.237657] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 52.242758] ? kasan_check_write+0x14/0x20 [ 52.246988] ? wake_up_q+0xaa/0x100 [ 52.250626] ? __mutex_unlock_slowpath+0x420/0x870 [ 52.255563] vb2_core_streamoff+0x60/0x140 [ 52.259799] __vb2_cleanup_fileio+0x78/0x170 [ 52.264210] vb2_core_queue_release+0x20/0x80 [ 52.268719] _vb2_fop_release+0x1cf/0x2a0 [ 52.272861] vb2_fop_release+0x75/0xc0 [ 52.276757] vivid_fop_release+0x18e/0x430 [ 52.280985] ? vivid_remove+0x460/0x460 [ 52.284944] v4l2_release+0x224/0x3a0 [ 52.288735] __fput+0x3c5/0xb10 [ 52.292003] ? dev_debug_store+0x150/0x150 [ 52.296272] ? get_max_files+0x20/0x20 [ 52.300159] ? task_work_run+0x1bb/0x2b0 [ 52.304220] ? trace_hardirqs_off_caller+0x300/0x300 [ 52.309310] ? do_raw_spin_trylock+0x270/0x270 [ 52.313878] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.319402] ____fput+0x16/0x20 [ 52.322668] task_work_run+0x1f4/0x2b0 [ 52.326585] ? task_work_cancel+0x2c0/0x2c0 [ 52.330914] ? __close_fd+0x25f/0x3d0 [ 52.334701] ? do_syscall_64+0x8c/0x800 [ 52.338682] exit_to_usermode_loop+0x32a/0x3b0 [ 52.343251] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.348600] ? syscall_trace_enter+0x12a0/0x12a0 [ 52.353350] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 52.358105] do_syscall_64+0x696/0x800 [ 52.361978] ? syscall_return_slowpath+0x5f0/0x5f0 [ 52.366894] ? prepare_exit_to_usermode+0x232/0x3b0 [ 52.371912] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.376749] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.381928] RIP: 0033:0x400ef0 [ 52.385119] Code: 01 f0 ff ff 0f 83 b0 0a 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d dd 57 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 84 0a 00 00 c3 48 83 ec 08 e8 3a 01 00 00 [ 52.404011] RSP: 002b:00007ffd9a504bb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 52.411728] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400ef0 [ 52.418978] RDX: 00000000fffffdf5 RSI: 0000000020000240 RDI: 0000000000000003 [ 52.426246] RBP: 0000000000000000 R08: 0000000000cd0880 R09: 00000000004002e0 [ 52.433497] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401e00 [ 52.440754] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 52.449173] Kernel Offset: disabled [ 52.452836] Rebooting in 86400 seconds..